I have started something new with my class. I have the students fill out a "Learning Log" at the end of each class to help them keep track of what they've learned throughout the month.

I think this is important for both teachers and students. If the student says he never learned something in class, a quick look through the Learning Log might give different information. Also, it is something concrete that the student can take home as " proof" to themselves that they have (and are) improving their English. This is always good encouragement for them.